PhysicalConnectivity/src/main/kotlin/net/shadowfacts/phycon/network/block/redstone/RedstoneControllerBlock.kt

package net.shadowfacts.phycon.network.block.redstone

import net.minecraft.block.Block
import net.minecraft.block.BlockState
import net.minecraft.block.Material
import net.minecraft.item.ItemPlacementContext
import net.minecraft.server.world.ServerWorld
import net.minecraft.state.StateManager
import net.minecraft.state.property.Properties
import net.minecraft.util.Identifier
import net.minecraft.util.math.BlockPos
import net.minecraft.util.math.Direction
import net.minecraft.world.BlockView
import net.minecraft.world.World
import net.minecraft.world.WorldAccess
import net.shadowfacts.phycon.PhysicalConnectivity
import net.shadowfacts.phycon.network.FaceDeviceBlock
import java.util.*

/**
 * @author shadowfacts
 */
class RedstoneControllerBlock: FaceDeviceBlock<RedstoneControllerBlockEntity>(Settings.of(Material.METAL)) {

	companion object {
		val ID = Identifier(PhysicalConnectivity.MODID, "redstone_controller")
		val LIT = Properties.LIT
	}

	// todo: don't just copy this from the Interface block
	override val faceThickness = 3.0
	override val faceShapes = mapOf(
		Direction.DOWN to createCuboidShape(0.0, 0.0, 0.0, 16.0, 3.0, 16.0),
		Direction.UP to createCuboidShape(0.0, 13.0, 0.0, 16.0, 16.0, 16.0),
		Direction.NORTH to createCuboidShape(0.0, 0.0, 0.0, 16.0, 16.0, 3.0),
		Direction.SOUTH to createCuboidShape(0.0, 0.0, 13.0, 16.0, 16.0, 16.0),
		Direction.WEST to createCuboidShape(0.0, 0.0, 0.0, 3.0, 16.0, 16.0),
		Direction.EAST to createCuboidShape(13.0, 0.0, 0.0, 16.0, 16.0, 16.0)
	)

	override fun appendProperties(builder: StateManager.Builder<Block, BlockState>) {
		super.appendProperties(builder)
		builder.add(LIT)
	}

	override fun createBlockEntity(world: BlockView) = RedstoneControllerBlockEntity()

	override fun getPlacementState(context: ItemPlacementContext): BlockState {
		val state = super.getPlacementState(context)
		return state.with(LIT, isPowered(context.world, context.blockPos, state[FACING]))
	}

	override fun neighborUpdate(state: BlockState, world: World, pos: BlockPos, neighborBlock: Block, neighborPos: BlockPos, bl: Boolean) {
		// this can't be done in getStateForNeighborUpdate because getEmittedRedstonePower is defined in World not WorldAccess
		if (!world.isClient) {
			val wasLit = state[LIT]
			val isLit = isPowered(world, pos, state[FACING])
			if (wasLit != isLit) {
				toggleLit(state, world, pos)
			}
		}
	}

	private fun isPowered(world: World, pos: BlockPos, facing: Direction): Boolean {
		val offset = pos.offset(facing)
		return world.getEmittedRedstonePower(offset, facing) > 0
	}

	private fun toggleLit(state: BlockState, world: World, pos: BlockPos) {
		world.setBlockState(pos, state.cycle(LIT), 2)
		getBlockEntity(world, pos)!!.redstoneStateChanged()
	}

}